Give five examples of expressions containing one variable and five examples of expressions containing two variables.
(i) x – 4 (ii) 5 – y (iii) 2x + 5
(iv) 10x + 4 (v) 11 – z
(b) Five examples containing two variables are:
(i) 7x – 2y (ii) 5x + 2y – 10 (iii) 6x + z – 2
(iv) 15y – z (v) 9x – 10z
Classify the coefficient of each term in the expression
x2y2 – 10x2y + 5xy2 – 20.
Coefficient of x2y2 is 1.
Coefficient of x2y is –10. Coefficient of xy2 is 5.
write two terms which are like
(i) 7xy (ii) 4mn2 (iii) 21.
(i) Two terms like 7xy are: –3xy and 8xy.
(ii) Two terms like 4mn2 are: 6mn2 and –2n2m.
(iii) Two terms like 21 are: 51 and -7b.
Construct:
(a) 3 binomials with only x as a variable;
(b) 3 binomials with x and y as variables;
(c) 3 monomials with x and y as variables;
(d) 2 polynomials with 4 or more terms.
(a) 1, 5x - 4 2. 3x + 2 3. 10 + 2x
(b) 1, 2x + 3y 2. 5x - y 3. x - 3y
(c) 1, 2xy 2. xy 3. -7xy
(d) 1. 2x3 -x2 + 6x - 8 2. 10 + 7x - 2x3 + 4x3